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Chemistry 2012 JAMB Past Questions

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31
Commercial bleaching can be carried out using
  • A. sulphur (IV) oxide and ammonia
  • B. hydrogen sulphide and chlorine
  • C. chlorine and sulphur (IV) oxide
  • D. ammonia and chlorine
View Answer & Discuss (1) JAMB 2012
32
Mineral acids are usually added to commercial hydrogen peroxide to
  • A. oxidize it
  • B. decompose it
  • C. minimize its decomposition
  • D. reduce it to water and oxygen
View Answer & Discuss (2) JAMB 2012
33

Which of the following compounds will burn with a brick-red colour in a non-luminous Bunsen flame?

  • A. LiCI
  • B. NaCl
  • C. CaCl2
  • D. MgCl2
View Answer & Discuss (4) JAMB 2012
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34

The purest form of iron which contains only about 0.1% carbon is

  • A. pig iron
  • B. wrought iron
  • C. cast iron
  • D. iron pyrite
View Answer & Discuss (1) JAMB 2012
35
A common characteristic between zinc and the other transition elements is the ability to
  • A. have variable oxidation states
  • B. from complex ions
  • C. act as a catalyst
  • D. from coloured ions
View Answer & Discuss (2) JAMB 2012
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